Lighter and Brighter or F1.4 Never Looked So GoodThe Sigma 30mm 1.4 DC DN Contemporary is a high performance prime with a large aperture of F1.4 designed for APS-C Mirrorless cameras including Sony E mount and Micro Four Thirds. The Contemporary line is part of Sigma Global Vision and is the perfect blend of image quality and compact size. The large aperture is great for lowlight and for creating depth of field and its small size makes it highly portable. A stepping ring motor provides fast and accurate autofocus and is highly useful for video work. It is constructed with nine rounded aperture blades. Like all SGV lenses, each lens is hand crafted in our single factory in Aizu Japan, individually inspected before shipping and work with the Sigma USB Dock to update firmware and focus calibrate.